Stefan Meyer is a PhD student at the Space Research and Planetary Sciences department of the Physics Institute at the University of Bern, Switzerland. He is developing the Neutral gas and Ion Mass spectrometer (NIM), which is part of the Particle Environment Package (PEP) carried by ESA’s L-class mission JUICE (JUpiter ICy moons Explorer). NIM will be used to measure the chemical composition of the atmospheres of the icy Jovian moons, as well as the ion composition of the ionospheres.
For the poster he presented at the EGU, measurements with the prototype instrument were performed in the neutral (open source) and thermal (closed source) mode. The results of these measurements with respect to fragmentation and density enhancements in the closed source mode are presented. Furthermore, a direct comparison between open and closed source mode measurements is given.

About EGU

EGU, the European Geosciences Union, is Europe’s premier geosciences union, dedicated to the pursuit of excellence in the Earth, planetary, and space sciences for the benefit of humanity, worldwide. It was established in September 2002 as a merger of the European Geophysical Society (EGS) and the European Union of Geosciences (EUG), and has headquarters in Munich, Germany.